Thousands of colored light bulbs switched on in unison Sunday night, a tribute to more than 400 beloved individuals who have passed away.

The crowd gathered outside the Great Falls Visitor Center in Overlook Park for the 40th annual Memorial Tree Lighting Ceremony. The Great Falls Central Catholic High School Cantores Choir sang several Christmas carols, transitioning to a hum after the first verse of “Silent Night” as the names were read to family and friends looking on.

“We’re going to light up the hill,” an organizer said during the opening remarks, noting the humble beginning of the holiday tradition 40 years ago, before the park existed.

The ceremony has grown from the lighting of a single tree to the stringing of thousands of lights over trees and shrubs across the hillside.

Some of those attending the ceremony walked among the lights, taking photos or just taking in the view.

The Visitor Center was open for the event, offering hot chocolate and cider to those braving the breeze to pay their respects.